Fundamental Mechanistic Understanding of Electrocatalysis of Oxygen Reduction on Pt and Non-Pt Surfaces: Acid versus Alkaline Media

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="491604.fig.007a" src="https://static.hindawi.com/articles/apc/volume-2012/491604/figures/491604.fig.007a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>Square wave voltammetry in 0.1 M NaOH</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="491604.fig.007b" src="https://static.hindawi.com/articles/apc/volume-2012/491604/figures/491604.fig.007b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>Square wave voltammetry in 0.1 M HCIO<sub>4</sub></td></tr></table></td></tr></table>

<table>SWV profiles of FeTPP/C catalyst as a function of heat treatment temperature in (a) 0.1 M NaOH and (b) 0.1 M HClO<sub>4</sub> electrolytes. Insets show the peak potential of the Fe<sup>2+/3+</sup> redox couple as a function of the heat treatment temperature. SWV experiment parameters: step potential −5 mV, amplitude −20 mV, and scan frequency −10 Hz.</table>

Advances in Physical Chemistry

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Figure 7

Figure 7: Fundamental Mechanistic Understanding of Electrocatalysis of Oxygen Reduction on Pt and Non-Pt Surfaces: Acid versus Alkaline Media 